Bit vague here but there is a long time cruising couple by the name of De Ridder (Jane and Michel) of the yacht Magic Dragon. They have been toting around a small motor bike on MD for donkey's years. From memory it's a small Honda , or similar, around 125cc. If you check out their blog at Setsail.com i'm sure you will find some useful information including how they stow the thing and how they get it on and off the boat.How would you put a small motorbike on a 30ft boat? Also, what kind of bike would you want to have, if your intent was to sail throught the great lakes, 3 days at a time, and returning home for a week in between each leg?